34 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.70 



not appressed; axial sculpture of (on the penultimate whorl about 

 18) protractively oblique narrow close set equal ribs crossing the 

 whorls on the spire, obsolete on the base and pillar; incremental lines 

 feeble; spiral sculpture of faint obscure threads between the ribs, 

 and two sharp grooves at the margin of the base, which seem to 

 duplicate the suture when one of them is exposed; the base is free 

 from ribs but behind the aperture is a well defined hump or varix; 

 outer lip produced in front, the anal sulcus shallow leaving an ill- 

 defined fasciole, aperture narrow, canal short and wide. Length, 11; 

 diameter, 4 mm. U. S. Nat. Mus. Cat. No. 108298. 

 Off Georgia, a dozen worn specimens. 



CLATHRODRILLIA INIMICA, new species 



Shell minute, white, with a smooth nucleus of one and a half to 

 two whorls, and five subsequent prominently sculptured whorls; suture 

 distinct, appressed; the edge in front thickened and undulated by the 

 sculpture, the anal sulcus shallow but the fasciole constricted and 

 nearly smooth; axial sculpture of (on the last whorl 16) narrow, 

 nearly straight rounded ribs with subequal or narrower interspaces, 

 crossing the whorls from a slight shoulder in front of the anal fasciole 

 to the succeeding suture and becoming gradually obsolete on the base; 

 the incremental lines are well marked ; spiral sculpture on the second 

 normal whorl 3, on the next 4, and on the last whorl 10 slender threads 

 with wider interspaces, overrunning the ribs and in front of these 

 finer close-set threads on the pillar; aperture hardly wider than the 

 canal, the outer lip thin, arcuately produced in front, pillar very short, 

 attenuated in front. Length, 6.6; diameter, 3 mm. U. S. Nat. Mus. 

 Cat. No. 108292. 



Off Georgia, about 25 specimens. 



This has the general aspect of P. perdecorata but is smaller, with a 

 more constricted fasciole and more numerous spirals. It also wants 

 the varicose and inflected outer lip. 



CLATHRODRILLIA ORELLANA, new species 



Shell small, slender, whitish, with a smooth nucleus of one and a 

 half, and four and a half subsequent whorls; suture distinct, not 

 constricted or appressed; anal sulcus wide and shallow, the fasciole 

 not excavated, inconspicuous; axial sculpture of protractively flexuous 

 incremental lines, stronger near the apex, and in some cases feeble 

 narrow ribs are developed on the earlier whorls, with wider inter- 

 spaces; spiral sculpture of very fine threads, equal and with subequal 

 interspaces, though a little coarser on the well-rounded base; aperture 

 slightly wider than the canal, the outer lip thin, flexuous, sometimes 

 a feeble thickening behind it; the whorls are usually rounded but 

 sometimes there is a slight shoulder in front of the fasciole; pillar 



